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crypto: sha256 - Use same state format as legacy drivers

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Make the export and import functions for the sha224, sha256,
hmac(sha224), and hmac(sha256) shash algorithms use the same format as
the padlock-sha and nx-sha256 drivers, as required by Herbert.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250630160645.3198-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers 2025-06-30 09:06:41 -07:00
parent e0cd371691
commit 07f090959b
1 changed files with 95 additions and 0 deletions
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95
crypto/sha256.c
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@ -13,6 +13,43 @@
#include <linux/kernel.h>
#include <linux/module.h>
/*
* Export and import functions. crypto_shash wants a particular format that
* matches that used by some legacy drivers. It currently is the same as the
* library SHA context, except the value in bytecount must be block-aligned and
* the remainder must be stored in an extra u8 appended to the struct.
*/
#define SHA256_SHASH_STATE_SIZE 105
static_assert(offsetof(struct __sha256_ctx, state) == 0);
static_assert(offsetof(struct __sha256_ctx, bytecount) == 32);
static_assert(offsetof(struct __sha256_ctx, buf) == 40);
static_assert(sizeof(struct __sha256_ctx) + 1 == SHA256_SHASH_STATE_SIZE);
static int __crypto_sha256_export(const struct __sha256_ctx *ctx0, void *out)
{
struct __sha256_ctx ctx = *ctx0;
unsigned int partial;
u8 *p = out;
partial = ctx.bytecount % SHA256_BLOCK_SIZE;
ctx.bytecount -= partial;
memcpy(p, &ctx, sizeof(ctx));
p += sizeof(ctx);
*p = partial;
return 0;
}
static int __crypto_sha256_import(struct __sha256_ctx *ctx, const void *in)
{
const u8 *p = in;
memcpy(ctx, p, sizeof(*ctx));
p += sizeof(*ctx);
ctx->bytecount += *p;
return 0;
}
/* SHA-224 */
const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
@ -51,6 +88,16 @@ static int crypto_sha224_digest(struct shash_desc *desc,
return 0;
}
static int crypto_sha224_export(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export(&SHA224_CTX(desc)->ctx, out);
}
static int crypto_sha224_import(struct shash_desc *desc, const void *in)
{
return __crypto_sha256_import(&SHA224_CTX(desc)->ctx, in);
}
/* SHA-256 */
const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
@ -89,6 +136,16 @@ static int crypto_sha256_digest(struct shash_desc *desc,
return 0;
}
static int crypto_sha256_export(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export(&SHA256_CTX(desc)->ctx, out);
}
static int crypto_sha256_import(struct shash_desc *desc, const void *in)
{
return __crypto_sha256_import(&SHA256_CTX(desc)->ctx, in);
}
/* HMAC-SHA224 */
#define HMAC_SHA224_KEY(tfm) ((struct hmac_sha224_key *)crypto_shash_ctx(tfm))
@ -128,6 +185,19 @@ static int crypto_hmac_sha224_digest(struct shash_desc *desc,
return 0;
}
static int crypto_hmac_sha224_export(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export(&HMAC_SHA224_CTX(desc)->ctx.sha_ctx, out);
}
static int crypto_hmac_sha224_import(struct shash_desc *desc, const void *in)
{
struct hmac_sha224_ctx *ctx = HMAC_SHA224_CTX(desc);
ctx->ctx.ostate = HMAC_SHA224_KEY(desc->tfm)->key.ostate;
return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
}
/* HMAC-SHA256 */
#define HMAC_SHA256_KEY(tfm) ((struct hmac_sha256_key *)crypto_shash_ctx(tfm))
@ -167,6 +237,19 @@ static int crypto_hmac_sha256_digest(struct shash_desc *desc,
return 0;
}
static int crypto_hmac_sha256_export(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export(&HMAC_SHA256_CTX(desc)->ctx.sha_ctx, out);
}
static int crypto_hmac_sha256_import(struct shash_desc *desc, const void *in)
{
struct hmac_sha256_ctx *ctx = HMAC_SHA256_CTX(desc);
ctx->ctx.ostate = HMAC_SHA256_KEY(desc->tfm)->key.ostate;
return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
}
/* Algorithm definitions */
static struct shash_alg algs[] = {
@ -181,7 +264,10 @@ static struct shash_alg algs[] = {
.update = crypto_sha224_update,
.final = crypto_sha224_final,
.digest = crypto_sha224_digest,
.export = crypto_sha224_export,
.import = crypto_sha224_import,
.descsize = sizeof(struct sha224_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
{
.base.cra_name = "sha256",
@ -194,7 +280,10 @@ static struct shash_alg algs[] = {
.update = crypto_sha256_update,
.final = crypto_sha256_final,
.digest = crypto_sha256_digest,
.export = crypto_sha256_export,
.import = crypto_sha256_import,
.descsize = sizeof(struct sha256_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
{
.base.cra_name = "hmac(sha224)",
@ -209,7 +298,10 @@ static struct shash_alg algs[] = {
.update = crypto_hmac_sha224_update,
.final = crypto_hmac_sha224_final,
.digest = crypto_hmac_sha224_digest,
.export = crypto_hmac_sha224_export,
.import = crypto_hmac_sha224_import,
.descsize = sizeof(struct hmac_sha224_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
{
.base.cra_name = "hmac(sha256)",
@ -224,7 +316,10 @@ static struct shash_alg algs[] = {
.update = crypto_hmac_sha256_update,
.final = crypto_hmac_sha256_final,
.digest = crypto_hmac_sha256_digest,
.export = crypto_hmac_sha256_export,
.import = crypto_hmac_sha256_import,
.descsize = sizeof(struct hmac_sha256_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
};